not currently using gotoTab, to take a look at the source code, gotoTab only works for the default tabBar (that pile of headings), and only provides additional operations at gotoTab. The specific gotoTab is called during onPress, so it is only used for additional operations when the user clicks on defaultTabBar.

if you just want to manually switch to a tab, that currently uses the page attribute in Tabs, specify which page to jump to. Note that the attribute value should be of type state, which triggers re-rendering.